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First two letters of IADC Code

1 2 3 for Milled Tooth, 4 5 6 7 8 for Tungsten Carbide Bit (Increasing hardness)

1 2 3 4 increasing hardness

Bit Diameter in mm
Bearing Type
  1. FB - Friction Bearing
  2. RB - Roller Bearing
Nozzle Type
  1. JN Jet Nozzle
  2. CN Center Jet Nozzle
  3. CX Combines
Leg Variation
  1. SH Standard Shirttail Hardfacing
  2. EH Extended Shirttail Hardfacing
  3. IS Inserts come Standard Shirttail Hardfacing
  4. IE Inserts come Extended Shirttail Hardfacing
Cone Variations
  1. A - Chisel inserts
  2. B - Conical inserts
  3. C - Spherical inserts
  4. D - Special inserts
  5. M - Mill tooth
  6. X - No gauge inserts
  7. Y - Single gauge inserts
  8. Z - Double gauge inserts
MT63 250.8 RB JN IE AY

 

Rock Roller Bit Designation System

 

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